US11369423B2 - Medical anti-loosening screw based on organism osteogenesis function - Google Patents
Medical anti-loosening screw based on organism osteogenesis function Download PDFInfo
- Publication number
- US11369423B2 US11369423B2 US16/645,412 US201916645412A US11369423B2 US 11369423 B2 US11369423 B2 US 11369423B2 US 201916645412 A US201916645412 A US 201916645412A US 11369423 B2 US11369423 B2 US 11369423B2
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- United States
- Prior art keywords
- screw
- main rod
- organism
- loosening
- cross
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/84—Fasteners therefor or fasteners being internal fixation devices
- A61B17/86—Pins or screws or threaded wires; nuts therefor
- A61B17/8625—Shanks, i.e. parts contacting bone tissue
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/84—Fasteners therefor or fasteners being internal fixation devices
- A61B17/86—Pins or screws or threaded wires; nuts therefor
- A61B17/8605—Heads, i.e. proximal ends projecting from bone
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/84—Fasteners therefor or fasteners being internal fixation devices
- A61B17/86—Pins or screws or threaded wires; nuts therefor
- A61B2017/8655—Pins or screws or threaded wires; nuts therefor with special features for locking in the bone
Definitions
- the present disclosure relates to the technical field of medical devices, and in particular to a medical anti-loosening screw based on an organism osteogenesis function.
- the word “fracture” has been associated with us since recorded human history.
- the human bone has the function of “osteoclastogenesis-osteogenesis”, and the fracture has a self-healing tendency.
- the process of natural healing of the fracture can be roughly divided into a hematoma organization stage (two weeks), a callus formation stage (one to two months), and a bone remodeling stage (two months to two years).
- the internal fixation material has completed its function upon the fractured bone has passed through the “callus formation stage”, and it is generally necessary to remove the internal fixation material at a later stage to prevent hindrance of further remodeling of the fractured bone at the later stage due to its “stress shielding” effect.
- An object of the present disclosure is to provide a medical anti-loosening screw based on an organism osteogenesis function, which can be used in the medical fields such as orthopedics (spine, four limbs, pelvis, joints, etc.), maxillofacial surgery, odontology, and veterinarians, and which can be effectively prevented from postoperative loosening after being implanted.
- the present disclosure provides a medical anti-loosening screw based on an organism osteogenesis function, comprising: a screw head and a screw rod connected to the screw head,
- the screw rod comprises a main rod and a thread spirally wound around the main rod; and a cross section of the main rod is in a non-circular shape.
- the cross section of the main rod is in a shape of fat triangle or quadrangle or pentagon or hexagon or ellipse.
- the cross section of the main rod is in a shape of square, and a cross-sectional area of an outer circle of the thread is 1.59 to 3.61 times as large as a cross-sectional area of the main rod.
- the cross section of the main rod is in a shape of regular pentagon, and a cross-sectional area of an outer circle of the thread is 1.44 to 3.61 times as large as a cross-sectional area of the main rod.
- the cross section of the main rod is in a shape of regular hexagon, and a cross-sectional area of an outer circle of the thread is 1.49 to 3.61 times as large as a cross-sectional area of the main rod.
- a ratio between a radius of an outer circle of the thread and a radius of a circumscribed circle of the main rod is 1.2 to 1.9.
- a cavity structure is provided inside the main rod; and alternatively, the main rod is solid inside.
- the screw head is in a circular shape, and a hexagonal groove or a cross groove or a slotted groove or a Torx groove or a Pozidriv groove is provided on the screw head;
- the screw head is in a dovetail shape.
- the circular screw head is provided with a locking thread.
- the dovetail-shaped screw head is a universal-type screw head.
- the present disclosure provides a medical anti-loosening screw based on an organism osteogenesis function, comprising: a screw head and a screw rod connected to the screw head; wherein the screw rod comprises a main rod and a thread spirally wound around the main rod; and a cross section of the main rod is in a non-circular shape.
- a bone tunnel is formed after the screw is implanted by tapping, and the thread cuts into the side wall of the bone tunnel to get a grip thereon; there is a gap between the main diameter of the screw and the bone tunnel, and the gap is filled with “bone residues” formed after tapping.
- the “bone residues” will form osseous callus and even normal new bone tissue like “hardening concrete” after the “callus formation stage” within about one to two months after the operation, to construct a hard non-cylindrical bone tunnel and adhere closely around the main diameter of the screw, such that the side surface of the main rod of the screw is significantly restrained and a relatively strong side thrust resistance is generated when the screw is untightened.
- This side thrust resistance is much greater than a friction between the surface of a traditional screw and the bone tunnel and has the effect of getting the screw stuck, therefore the loosening rate and the pullout rate can be significantly reduced, and a significant anti-loosening effect can be achieved.
- the screw may be removed smoothly by only increasing the screw untightening torque.
- the medical anti-loosening screw based on an organism osteogenesis function is applicable to the medical fields such as orthopedics (spine, four limbs, pelvis, joints, etc.), maxillofacial surgery, odontology, and veterinarians, and can be effectively prevented from postoperative loosening after being implanted.
- FIG. 1 is a schematic structural view of a medical anti-loosening screw based on an organism osteogenesis function according to an embodiment of the present disclosure
- FIG. 2 is a schematic view of a main rod with a cross section in a shape of ellipse according an embodiment of the present disclosure
- FIG. 3 is a schematic view of a main rod with a cross section in a shape of fat triangle according to an embodiment of the present disclosure
- FIG. 4 is a schematic view of a main rod with a cross section in a shape of square according to an embodiment of the present disclosure
- FIG. 5 is a schematic view of a main rod with a cross section in a shape of regular pentagon according to an embodiment of the present disclosure.
- FIG. 6 is a schematic view of a main rod with a cross section in a shape of a regular hexagon according to an embodiment of the present disclosure.
- orientation or positional relationships indicated by the terms such as “center”, “up”, “down”, “left”, “right”, “vertical”, “horizontal”, “inside”, and “outside” are the orientation or positional relationships shown based on the drawings, and these terms are intended only to facilitate the description of the present disclosure and simplify the description, but not intended to indicate or imply that the referred devices or elements must be in a particular orientation or constructed or operated in the particular orientation, and therefore should not be construed as limiting the present disclosure.
- the terms “first”, “second”, and “third” are used for descriptive purposes only, and should not be understood as an indication or implication of relative importance.
- connection may be fixed connection or detachable connection or integral connection, may be mechanical connection or electric connection, or may be direct coupling or indirect coupling via an intermediate medium or internal communication between two elements.
- connection may be fixed connection or detachable connection or integral connection, may be mechanical connection or electric connection, or may be direct coupling or indirect coupling via an intermediate medium or internal communication between two elements.
- FIG. 1 a medical anti-loosening screw based on an organism osteogenesis function according to an embodiment of the present disclosure will be described in detail below with reference to the drawings.
- An embodiment of the present disclosure provides a medical anti-loosening screw based on an organism osteogenesis function, comprising: a screw head 1 and a screw rod 2 connected to the screw head 1 ;
- the screw rod 2 comprises a main rod 21 and a thread 22 spirally wound around the main rod 21 ; and a cross section of the main rod 21 is in a non-circular shape.
- a bone tunnel is formed after the screw is implanted by tapping, and the thread 22 cuts into the side wall of the bone tunnel to get a grip thereon; there is a gap between the main diameter of the screw and the bone tunnel, and the gap is filled with “bone residues” formed after tapping.
- the “bone residues” will form osseous callus and even normal new bone tissue like “hardening concrete” after the “callus formation stage” within about one to two months after the operation, to construct a hard non-cylindrical bone tunnel and adhere closely around the main diameter of the screw, such that the side surface of the main rod 21 of the screw is significantly restrained and a relatively strong side thrust resistance is generated when the screw is untightened.
- This side thrust resistance is much greater than a friction between the surface of a traditional screw and the bone tunnel and has the effect of getting the screw stuck, therefore the loosening rate and the pullout rate can be significantly reduced, and a significant anti-loosening effect can be achieved.
- the screw may be removed smoothly by only increasing the screw untightening torque.
- the main rod 21 has a cross section in a shape of fat triangle or quadrangle or pentagon or hexagon or ellipse.
- the “bone residues” will form osseous callus and even normal new bone tissue like “hardening concrete” after the “callus formation stage” within about one to two months after the operation, to construct a hard bone tunnel being in a fat-triangular-prism shape and adhere closely around the main rod 21 of the screw, such that the side surface of the fat-triangular-prism-shaped main rod 21 of the screw is significantly restrained and a relatively strong side thrust resistance (which is similar to a driving force from a hexagonal socket screwdriver) is generated when the screw is untightened.
- the radius R2 of the main rod 21 of the traditional screw is set to be 1 (the radius R1 of the thread 22 is 1.5).
- Different cross-sectional shapes of the main rod 21 will be described in detail below.
- the main rod 21 has a cross section in a shape of ellipse
- a ratio between major and minor semi-axes of the ellipse is smaller than ⁇ square root over (2) ⁇
- the cross-sectional area of an outer circle of the thread 22 is 1.49 to 3.61 times, for example, but not limited to, 1.49, 1.69, 1.96, 2.25, 2.56, 2.89, 3.24, or 3.61 times, as large as the cross-sectional area of the main rod 21 .
- a ratio between major and minor semi-axes of the ellipse is smaller than ⁇ square root over (2) ⁇
- the cross-sectional area of an outer circle of the thread 22 is 1.49 to 3.61 times, for example, but not limited to, 1.49, 1.69, 1.96, 2.25, 2.56, 2.89, 3.24, or 3.61 times, as large as the cross-sectional area of the main rod 21 .
- the cross-sectional area of the outer circle of the thread 22 is 1.49 to 3.61 times, for example, but not limited to, 1.49, 1.69, 1.96, 2.25, 2.56, 2.89, 3.24, or 3.61 times, as large as the cross-sectional area of the main rod 21 . As shown in FIG.
- b ( ⁇ square root over (3) ⁇ 1) a
- c 1 ⁇ 2a
- the cross-sectional area of the outer circle of the thread 22 is 1.49 to 3.61 times as large as the cross-sectional area of the main rod 21 .
- the main rod 21 has a cross section in a shape of square, and the cross-sectional area of the outer circle of the thread 22 is 1.59 to 3.61 times, for example, but not limited to, 1.59, 1.69, 1.96, 2.25, 2.56, 2.89, 3.24, or 3.61 times, as large as the cross-sectional area of the main rod 21 . As shown in FIG.
- the radius R1 of the outer circle of the thread 22 is larger than 1 ⁇ 2 ⁇ b, and thus R1 is in the range of (1.26 to 1.9), for example, R1 may be, but not limited to, 1.26, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, or 1.9.
- the cross-sectional area of the outer circle of the thread 22 is 1.59 to 3.61 times as large as the cross-sectional area of the main rod 21 .
- the main rod 21 has a cross section in a shape of regular pentagon, and the cross-sectional area of the outer circle of the thread 22 is 1.44 to 3.61 times, for example, but not limited to 1.44, 1.69, 1.96, 2.25, 2.56, 2.89, 3.24 or 3.61 times, as large as the cross-sectional area of the main rod 21 . As shown in FIG.
- the radius R 1 of the outer circle of the thread 22 is in the range of (1.2 to 1.9), and for example, R 1 may be, but is not limited to, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, or 1.9.
- the cross-sectional area of the outer circle of the thread 22 is 1.44 to 3.61 times as large as the cross-sectional area of the main rod 21 .
- the main rod 21 has a cross section in a shape of regular hexagon, and the cross-sectional area of the outer circle of the thread 22 is 1.49 to 3.61 times, for example, but not limited to, 1.49, 1.69, 1.96, 2.25, 2.56, 2.89, 3.24, or 3.61 times, as large as the cross-sectional area of the main rod 21 . As shown in FIG.
- the cross-sectional area of the outer circle of the thread 22 is 1.49 to 3.61 times as large as the cross-sectional area of the main rod 21 .
- the main rod 21 may have a cross section in a shape of non-circular shape other than fat triangle, square, regular pentagon, regular hexagon, or ellipse described above, and the ratio between the radius of the outer circle of the thread 22 and the radius of the circumscribed circle of the main rod 21 is 1.2 to 1.9, and may be for example, but not limited to, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, or 1.9.
- the screw rod 2 at its end facing away from the screw head 1 , is provided with a tapping groove.
- the tip of the screw may be additionally designed as a self-tapping screw with a tapping groove.
- a cavity structure is formed inside the main rod 21 ;
- the screw head 1 is in a circular shape with or without a locking thread, and a hexagonal groove or a cross (or Phillips) groove or a slotted groove or a Torx groove or a Pozidriv groove is formed on the screw head 1 ;
- the screw head 1 is a universal-type screw head that is freely turnable, and the screw head is in a dovetail shape.
- the screw head 1 may be designed in a circular shape with an internal hexagonal groove, a circular shape with a cross (or Phillips) groove, a circular shape with a slotted groove, a circular shape with an internal Torx groove, or a circular shape with a Pozidriv groove (trauma orthopedics, joint surgery, or cranio-maxillofacial surgery), or designed as a dovetail-shaped universal or fixed, or long dovetail-shaped pulling screw head 1 (spine surgery), or the like, according to the professional differences in its application fields.
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- Health & Medical Sciences (AREA)
- Orthopedic Medicine & Surgery (AREA)
- Surgery (AREA)
- Life Sciences & Earth Sciences (AREA)
- Heart & Thoracic Surgery (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Neurology (AREA)
- Medical Informatics (AREA)
- Molecular Biology (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
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Abstract
Description
Claims (9)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201820664990.2U CN208756130U (en) | 2018-05-04 | 2018-05-04 | Medical screw based on body osteogenesis function |
CN201820664990.2 | 2018-05-04 | ||
PCT/CN2019/082922 WO2019210774A1 (en) | 2018-05-04 | 2019-04-16 | Medical anti-loosening screw based on organism osteogenesis function |
Publications (2)
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US20210106370A1 US20210106370A1 (en) | 2021-04-15 |
US11369423B2 true US11369423B2 (en) | 2022-06-28 |
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Application Number | Title | Priority Date | Filing Date |
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US16/645,412 Active US11369423B2 (en) | 2018-05-04 | 2019-04-16 | Medical anti-loosening screw based on organism osteogenesis function |
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US (1) | US11369423B2 (en) |
CN (1) | CN208756130U (en) |
WO (1) | WO2019210774A1 (en) |
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Publication number | Priority date | Publication date | Assignee | Title |
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CN108523975A (en) * | 2018-05-04 | 2018-09-14 | 胡斯旺 | Medical screw based on body osteogenesis function |
Citations (11)
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US4486135A (en) * | 1981-07-14 | 1984-12-04 | Kabushiki Kaisha Aoyama Seisakusho | Tapping screw |
EP1207312A2 (en) | 2000-11-20 | 2002-05-22 | Celo Distribucion, S.A. | Screw for wood and similar materials |
CN201034104Y (en) | 2007-03-28 | 2008-03-12 | 精法精密工业股份有限公司 | Wave screw toothed sawtooth screw |
US20090245972A1 (en) * | 2008-04-01 | 2009-10-01 | Channg Chin Industry Corp. | Fastener with multiple threaded sections |
US8348573B2 (en) * | 2010-03-18 | 2013-01-08 | Essence Method Refine Co., Ltd. | Versatile fastener |
US9103364B2 (en) * | 2013-04-19 | 2015-08-11 | Fushang Co., Ltd | Screw |
CN205019148U (en) | 2015-10-12 | 2016-02-10 | 浙江科惠医疗器械股份有限公司 | Bone screw of screw in fast |
CN105451674A (en) | 2013-06-27 | 2016-03-30 | 蛇牌股份公司 | Out-of-round pedicle screw |
CN205626071U (en) | 2016-03-07 | 2016-10-12 | 天津京都贝思达生物技术有限公司 | Hollow rivet |
CN108523975A (en) | 2018-05-04 | 2018-09-14 | 胡斯旺 | Medical screw based on body osteogenesis function |
US20180266467A1 (en) * | 2017-03-20 | 2018-09-20 | Fushang Co., Ltd. | Screw With Cutting Teeth |
-
2018
- 2018-05-04 CN CN201820664990.2U patent/CN208756130U/en active Active
-
2019
- 2019-04-16 US US16/645,412 patent/US11369423B2/en active Active
- 2019-04-16 WO PCT/CN2019/082922 patent/WO2019210774A1/en active Application Filing
Patent Citations (12)
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US4486135A (en) * | 1981-07-14 | 1984-12-04 | Kabushiki Kaisha Aoyama Seisakusho | Tapping screw |
EP1207312A2 (en) | 2000-11-20 | 2002-05-22 | Celo Distribucion, S.A. | Screw for wood and similar materials |
CN201034104Y (en) | 2007-03-28 | 2008-03-12 | 精法精密工业股份有限公司 | Wave screw toothed sawtooth screw |
US20090245972A1 (en) * | 2008-04-01 | 2009-10-01 | Channg Chin Industry Corp. | Fastener with multiple threaded sections |
US8348573B2 (en) * | 2010-03-18 | 2013-01-08 | Essence Method Refine Co., Ltd. | Versatile fastener |
US9103364B2 (en) * | 2013-04-19 | 2015-08-11 | Fushang Co., Ltd | Screw |
CN105451674A (en) | 2013-06-27 | 2016-03-30 | 蛇牌股份公司 | Out-of-round pedicle screw |
US20160367304A1 (en) * | 2013-06-27 | 2016-12-22 | Aesculap Ag | Out-of-round pedicle screw |
CN205019148U (en) | 2015-10-12 | 2016-02-10 | 浙江科惠医疗器械股份有限公司 | Bone screw of screw in fast |
CN205626071U (en) | 2016-03-07 | 2016-10-12 | 天津京都贝思达生物技术有限公司 | Hollow rivet |
US20180266467A1 (en) * | 2017-03-20 | 2018-09-20 | Fushang Co., Ltd. | Screw With Cutting Teeth |
CN108523975A (en) | 2018-05-04 | 2018-09-14 | 胡斯旺 | Medical screw based on body osteogenesis function |
Non-Patent Citations (3)
Title |
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CNIPA; Notification to Grant Patent Right dated Mar. 21, 2019 in CN Application No. 201820664990.2. |
IB; International Search Report dated Jun. 25, 2019 in Application No. PCT/CN2019/082922. |
IB; Written Opinion dated Jun. 25, 2019 in Application No. PCT/CN2019/082922. |
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WO2019210774A1 (en) | 2019-11-07 |
US20210106370A1 (en) | 2021-04-15 |
CN208756130U (en) | 2019-04-19 |
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